Wood-grooving machine



p 1930- R. R. HIBBS v 1,775,430

WOOD GROOVING MACHINE Filed Dec. 3, 1929 2 ShGOtS-ShGGC 1 In venior aEmma/LE fljjw A ttbmcy Sept. 9, 1930.

R. R. HIBBS WOOD GROOVING MACHINE Filed Dec. 5, 1929 2 Sheets-Sheet 2 Invcntor Emma Z2. 5%,

A ttorney Patented Sept. 9,1930

UNITED sir-Ares PATENTOFFICE .1 i

RUSSELL nusr'nnsns, or CAPEemannnauiivrrssoom woon-Gaoovm MACHINE 7Application filed December a, 1929. jserial ivbgumsv.

This invention relates to wood grooving machines and more particularlyto devices of this character of the portable type. M

An important object of the invention is to 5 provide, in a manner ashereinafter set forth,

a wood grooving machine of the aforementionedgcharacter which includesan electric motor which is mountedthereon in a manner to drive the bitor other cutting tool when 10 the device is in use.

Another important object ofthe invention is to provide a wood groovingmachine of the character setforth wherein means is pro: vided forexpeditiously'adjusting the out ting bit for: regulating the depth ofthe groove to be cut and wherein the electric motor is associatedwiththe bit supporting means in sucha way as to be shiftedsimultaneously therewith. j l v j Other objects of theinvention are toprovide a wood groovinglmachine of the character set forth which will besimplein 0011- struction, strong, durable; eflicient in its use andwhich. may be manufactured at low cost. Other objects and advantages ofthe invention will become apparentfrom a study of the followingspecification, takenin connection with the acconipanying drawings,wherein like characters of reference designate corresponding partsthroughout the several views, andwherein Figure 1 1s a view in s1deelevation of a wood grooving machine constructed 1n accordance with thisinvention.

Figure3 isa fragmentary view in'l o'ngitudinal vertical sectionSlIOWiHgthG'bIt adjusting and clamping means. I

Figure 4: is a detail vlew n perspective of 40 the bit supporting meansand the motor in said base 2. i l

Figure 2 is a view in topplan thereof. 3

body portion of the machine which comprises i the base 2 and thevertically extending side 1 Walls 3 and 4. The sidewalls 3 a11d4; are

provided with an intermedia-te raised portion 5. As it will be seen thebody portion l con stitutes a channel member of substantially u-shapedcross section. As seen most clearlyin Figure 3 of the drawings the sides3 and Lof the body portion are provided with l i rearwardly andupwardlyextending recesses 0v 6 and a portion of the base 2 isQdi'rectedjupwardly as at 7, and terminates attliejupper endof the recesses 6 toprovi'de an'opening 1 A pair of inclined ribs 8 are oppositely disposedon theinner sideof thewalls 3 and l a and extend" upwardly andrearwardly thereon from the peripheraledges of the recesses 6. motorstand 9 (see Figure 4) is mounted in an inclined position between theside walls?) and 4 through the 'inedium of the chan nel 10 initslongitudinal side edges which slidably receive the ribs 8 for adjustablysupporting said stand between said side wane. On one side, the motorstand-9 is provided with a laterally projecting bracket 11 which extendsbelow the lower'fend of the motor stand and is bifurcated to provide apair of ournal arms 12 for rotatably supporting the opposite endportions of abushing 13QA. to

sprocket 14 is rigidly mounted on the bush ing 13 at a point between thejournal arms 12 as clearlyshown in Figure 4." The bushing 13 is providedwith a longitudinal bore 15 for the reception of a disc supportingmandrell6 having a left hand screw threaded portion 17 onits free lend.Themandrel -16is provided with anintegral flange or collar 18 forabutment with the adj acent end of the bushing 13 which collar acts as astop to limit the movementxof said mandrel through thebushing. On theopposite end of the bracket 11 a retaining nut 19 1s threaded on theprojecting end of the mandrel 16 for rigidly mounting the same in thebushing.

A set screw 20 is threaded through the bushing 13 adjacent thesprocketlifor engagement withthe adjacent portion of the mandrel 16 for furtherrigidly coupling said mandrel and bushing together. An integral longitudinally extending key or rib 21 is provided on the mandrel 16 forsecuring a grooving bit or other woodwork bit thereon in a manner toprevent relative rotary movement of said bit with respect to the mandreland this key may extend into a complemental opening in the bushing 13 ifit is desired to provide the same. The key receiving channel in thebushing 13 is designated by the reference character 22. If desired, thekey 21 may be dispensed with and the mandrel 16 provided with a flatside and the bore 15 of the bushing 13 may also be provided with a flatside to conform to the cross sectional shape of the mandrel for rigidlysecuring said mandrel therein against rotation. A bit 23 is rigidlymounted on the mandrel 16 against rotation thereon and a nut is mountedon the threaded portion 17 for retaining the bit thereon.

It is understood, of course, that the bit 23 is provided with a borehaving a groove in one side for thereception of the key 21 or if themandrel 16 is provided with a flat side. the bore in the bit will beprovided with a complementary flat side for keying the bit thereto.

The wall 4 is provided with a recess or slot 24 which merges into therecess 6 (see Figure 6) for accommodating the bracket 11. The mandrel 16with the bit 23 mounted thereon is disposed in the recess provided inthe body portion 1 by the recesses 6 and the upturned portion 7 of thebase 2.

An electric motor 25 is mounted on the upper end of the stand 9 throughthe medium of the supporting plate or arm 26 and the securing screws 27which extend therethrough and are threaded in the openings 28 in theupper end portion of said stand. The armature shaft 29 of the motorextends laterally therefrom and has mounted on its free end a sprocket30. An endless driving chain 31 is trained over the sprocket and thesprocket 14 on the bushing 13.

The underside of the motor stand 9 is provided with a centrally disposedlongitudinally extending dovetail groove 32 for slidably receiving acomplemental block 33 having arearwardly extending arm 34 thereonprovided with a transverse opening for rotatably receiving ahorizontally disposed shaft 35 which has its opposite end portionjournaled inthe bushings 36-36 in the side walls 3 and 4. At a pointadjacent the inner faces of the side walls 3 and 4 the shaft 35 hasrigidly mounted thereon a pair of pinion gears 38-37 which mesh with apair of rack bars 37 formed integrally with the lower side of the motorstand 9 and at the opposite side portion thereof. A set screw 38 isthreaded into the rear end of the arm 34 for engagement with the shaft35 for securing the same against rotation when desired and said setscrew is provided with a hand wheel or disc 39 at its free end.

A bridge piece 40 spans the side walls 3 and 4 and is secured theretothrough the down turned end flanges 41 for the passage of securingelements such as rivets 42. The bridge piece 40 is provided with a downturned forward portion 43 on which is formed an integral internallythreaded sleeve 44 for threadedly receiving a pressure screw 45provided, at its upper end, with a hand wheel 46. A pressure plate 47 isengaged on the lower end portion of the motor stand 9 and has itsopposite end provided with recesses for the reception of the guide ribs48 for adjustahly mounting said pressure plate on the side walls 3 and4. The pressure plate 47 has rigidly mounted on its upper side acomparatively small plate 49 which is provided with a lon ,cgitudinalgroove 50 in its upper face for the reception of the adjacent end of thepressure screw 45.

A laterally adjustable longitudinally extending gage 51 is mounted onthe body portion 1 of the machine through the medium of the rods 5252which extend through transverse bores provided in the sleeve formed onthe base 2and extending between the side walls 3 and-4. Set screws 5454are threaded into the sleeves 53 for engagement with the rods 52 formaintaining the in adjusted position. The gauge 51 is provided with arecess 55 for accommodating the bracket 11 when said gauge is movedClose to the side wall 4.

An upstanding handle 56 is mounted centrally between the side walls 3and 4 on the base 2 adjacentthe rear ends thereof and is provided, onits upper end, with a suitable electric switch 57 for controlling theflow of electric current to the motor 25 through the conductor wires 58.course, that the wires 58 lead to a suitable source of current supply.Adjacent the forward end of the base 2 a hand knob 59 is rigidly mountedon said base. The reference character 60-60 denotes a pair of oil cupsmounted on the bracket 11 for lubricating the bushing 13 at its oppositeend portion.

The gauge 51 is the thickness of the wall 4- and is of greater width atits bottom to all. w the same to come flush with the inside of the bodyportion when making narrow cuts. recess 55 in the gauge 51 must be largeenough to allow the chain and sprocket to operate without touching saidgauge when the same is set for wide cuts.

In the use of the machine, with the parts assembled shown in'thedrawings, the pressure screw 45 is backed off to relieve the pressure ofthe plate 47 on the motor stand 9 and the set screw 38 is. alsodisengaged from It is understood, of

tends through the side wall 3 as clearly seen in ,FigureQ, Rotation ofthe shaft 35 shifts the motor stand 9 in aninclined plane on the ribs 8through the medium of the rack bars 37 and the pinion gears 37 which arerigidly mounted on the shaft, In this manner the Theset screwc38prevents rotation of the shaft 85 and the pressure plate 47 inconjunction with the pressure screw maintains the motor stand 9 againstvibration as Well as any other undesired'movement. It will further beseen that the motor 25will be moved simultaneously with the bit 23 byreason of the fact that it is mounted rigidly on the stand 9 and, ofcourse,;sufiicient' slack is provided in the electric conductor whichextends from said motor to the switch57 to permit this adjustment to bemade Without breaking or straining said conductor;

Any suitable type of bit may be mounted on the mandrel 16 and the toolmay be utilized to plane doorsof any thickness as well as for makingmoldings such as screen mould and window" stops or for rabbeting' doorjambs. j r a It is believed that the many advantages of a wood groovingmachine constructed in accordance with this invention will be readilyunderstood, and although the preferred embodiment of the invention is asillustrated and described, it is to be understood that changes in thedetails of construction may be had which will fall within the scope ofthe invention as claimed.

What is claimed is 2+ 1. A wood grooving machine of the charing movementbetween the side walls, a bit rotatably supported on the lower end ofthe stand, a motor mounted on the stand, means driven by said motor torotate thebit and a means for shifting the stand on the bodyportioncomprising rack bars formed integrally on the base and piniongears in operative engagement with the rack bars and rotatably supportedbetween the side walls.

2. A wood grooving machine of the character described comprising a bodyportion of substantially U-shaped cross section and including a base andvertical opposed side walls having horizontally aligned recesses intheir lower portions, said base being pro vided with an openingcommunicating with the recesses in the side walls, an inclinedstand-adjustably mounted on the side walls,

a bracket; projecting laterally" and down wardlvfrom 'saidfstand'adjacent the outer face ofone of the sidewalls and terminating inhorizontal alignment with the recesses therein, a mandrel journaled insaid bracket and extendinginto the recesses, a bit rigidly mounted onthe mandrel, a motor on the up per end of the stand, means driven bysaid motor forrotating the bit and means mounted on the sidewalls foradjusting the stand in an inclined plane. i

A wood grooving machine of theflcharacter described comprising a 'bodyportion ofsubstantially ;U-shaped cross section and including base andvertical opposed side,

walls having horizontally aligned recesses in their lower "portlons,said base being providedwith an opening communicating with the recess inthe side walls, an inclined stand adjustablymountedon the side walls,abracket projecting laterally and downwardly from said stand adjacent theouter face of one of the side walls and terminating in horizontalalignment with the recesses therein, a mandrel j ournaled in saidbracket and extending into the recesses, a bit rigidly mounted on themandrel, a motor on the upperend of the stand, means driven by saidmotor for rotating the bit and means mounted on the side walls for adusting the, stand in an inclined plane, said means comprising a shaftjournaled for rotation, at its opposite end por tion, in the side walls,pinion gears rigidly mounted on said shaft for rotation therewith, rackbars mounted on the adjacent side of the stand in mesh with the piniongears, said stand being further provided, on itslower side, with alongitudinally extending dovetail grove, a complemental block slidablydisposed in the groove and having a rearwardly extending arm providedwith an opening for rotatably receiving the rotating shaft and manuallyoperable means for rotating the shaft.

4. A wood grooving machine of the character described comprising a bodyportion of substantially U-shaped cross section and including a base andvertical opposed side walls havinghorizontally aligned recesses in theirlower portions, said base being provided with an opening communicatingwith the res cess in the side walls, an inclined stand adjustablymounted on the side walls, a bracket projecting laterally and downwardlyfrom said stand adjacent the outer face of one of the side walls andterminating in horizontal;

alignment with the recesses therein, a man- 1 drel journaled in saidbracket and extending into the recesses, a bit rigidly mounted on the Vmandrel, a motor on the upper end of the i stand, means driven by saidmotor for rotating the bit and means mounted on the side walls foradjusting the stand in an inclined tion, in the side walls, pinion gearsrigidly mounted on said shaft for rotation therewith, rack bars mountedon the adjacent side of the stand in mesh with the pinion gears, saidstand being further provided, on its lower side, with a longitudinallyextending dovetail groove, a complemental block slidably disposed in thegroove and having a rearwardly extending arm provided with an openingfor rotatably receiving the rotating shaft and manually operable meansfor rotating the shaft, means mounted on the block engageable with theshaft for retaining the same against rotation, apressure plate supportedfor movement in an inclined plane on the side walls on the opposite sideof the stand, and a pressure screw supported on the body portion forclamping the pressure plate against the stand. In testimony whereof Iafiix my signature.

RUSSELL RUST HIBBS.

